ARP types

1. ARP:- It Maps the IP(network layer) address to mac layer address to enable IP packets to be sent across the network

2. Gratuitous ARP:- It sends a request with an identical source IP address and a destination IP address to detect duplicate IP address.

3. Proxy ARP :- It Enable a device that is physically located on one network and appear to be logically part of a different network connected to the same device.

4. Reverse ARP :- It request IP( Network layer) address for the MAC address. Often used by disklesss workstation because this type if devices has no way to store IP address to use when they boot.

Cisco UCS Director Orchestrator Concepts

1. Workflow :- A series of tasks arranged to automate a complex operation. It can contain at least one task, or any number of tasks as needed 

2. Task :- An automatic unit of work in Cisco UCS director orchestrator. It is a single action or operation with inputs and outputs 

3. Approval:- A Gate tasks that requires the intervention of Cisco UCS director user to allow a workflow to run to completion. This user is typically an Administrator who has go/no-go authority over the workflow process 

4. Service request :- Created every time you execute a workflow in Cisco UCS Director. It is process under the control of Cisco UCS director.

ACI Terminologies

1.  Bridge Domain :- Layer 2 forwarding Boundary  
2.  EPG:- Logical Grouping of objects that require similar policy
3. Application profile :- Logical container for grouping EPGs
4. Contracts:- Defines the communication between EPGs
5. Context:- Unique Layer 3 forwarfing and application policy domain 

6. Tenants :- Logical Container for application polices :- 

ITD perquisites and important information

A. Below are the prerequisites for Intelligent Traffic Director (ITD):-

1. Enhanced Layer 2 Package license.
2. Policy Based routing
3. IP SLA

B. Below feature must be enabled to configure ITD:-

1.   feature itd 

·     2.   feature pbr

·     3.   feature sla sender

·     4.   feature sla responder

I 

   Note :- ITD is not supported for IPV6.

 C. ITD replaces below two options:- 

 1. Policy-based routing.

 2. WCCP

D. ITD vs. WCCP
1. Require less TCAM entries.
2. Weighted load distribution

E. ITD is only supported in below platforms:-
1.  NEXUS 9000
2.  NEXUS 7000
3.  NEXUS 6000
4.  NEXUS 5000

On a cluster with three APICs, on which APIC can you see actual device package logs?

Device package logs can only be seen on APIC1.

NFS appliance port failover and network uplink failure on Cisco UCS

Appliance port:-
Failover cannot be configured in the UCS side for appliance ports.

Network Uplink failure:-

Appliance ports are shut down if the uplink that is pinned to it goes down.

For which two multicast distribution modes is RP configuration required?

Below two  multicast distribution modes require RP configuration.

1. BIDIR 

2. ASM